Renewable energy projects are being constructed throughout the UK, ranging from single structures to developments encompassing over one hundred wind turbines. The physical characteristics of such projects coupled with the size and siting of the developments can result in effects which impact on aviation. While any tall structure, including both wind turbines and anemometer masts, may present a hazard to air navigation, wind turbines can also create interference on air traffic control radar either through radar shadowing from the fixed structure or through false radar plots generated by the movement of the turbine blades.